How to upgrade PHP composer on a Plesk server

Alexander Davydov

Updated January 13, 2026 18:58

kb: how-to Plesk for Linux ABT: Group B

Applicable to:

How to upgrade PHP composer on a Plesk server?

Instructions for CentOS/RHEL/CloudLinux

Connect to the server via SSH
Check what version is currently used:

Note: replace X.X with the current PHP version and <Version> with the desired composer version.

# /opt/plesk/php/X.X/bin/php /usr/lib64/plesk-9.0/composer.phar --version
Update or downgrade to the specified version:

# /opt/plesk/php/X.X/bin/php /usr/lib64/plesk-9.0/composer.phar self-update <Version>

Note: In case the command above does not work, use the below one:
/opt/plesk/php/X.X/bin/php /usr/local/psa/var/modules/composer/composer.phar selfupdate --2

For example:

# /opt/plesk/php/7.3/bin/php /usr/lib64/plesk-9.0/composer.phar self-update 2.0.8
Upgrading to version 2.0.8 (stable channel).

Instructions for Debian/Ubuntu

Connect to the server via SSH
Check what version is currently used:

Note: replace X.X with the current PHP version and <Version> with the desired composer version.

# /opt/plesk/php/X.X/bin/php /usr/lib/plesk-9.0/composer.phar --version
Update or downgrade to the specified version:

# /opt/plesk/php/X.X/bin/php /usr/lib/plesk-9.0/composer.phar self-update <Version>

Note: In case the command above does not work, use the below one:
/opt/plesk/php/X.X/bin/php /usr/local/psa/var/modules/composer/composer.phar selfupdate --2

For example:

# /opt/plesk/php/7.3/bin/php /usr/lib/plesk-9.0/composer.phar self-update 2.0.8
Upgrading to version 2.0.8 (stable channel).

2 comments

Unknown User
August 01, 2023 20:39

I place the comand as yoour examples and get "No such file or directory"

0
Joe
April 17, 2024 11:33

Following the Ubuntu instructions works as intended. However after a while Composer is downgraded back to 1.x, probably because of Plesk auto updates.

0

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